Why do you need to seal your pump?

To understand the importance of pump seals, we first have to go back to some pumping basics. Fluids enter your pump through the suction nozzle at the centre of a rotating impeller. As the impeller rotates, the vanes fill with fluid and are forced out of the pump housing through the discharge nozzle. Due to the discharge pressure, the fluid attempts to exit through the rotating shaft. This leads to fluid loss and a dangerous working environment. That’s why you need a sealing solution which minimises the leakage!


How pump shaft seals work

The (water) lubricated lip seals run over a partially grooved bush placed over the pump shaft. The helical shape of the grooves and peripheral velocity of the bush create water flow between the grooves and the lip seal.


Download industrial brochure

Download the industrial brochure to learn more about our sealing solutions for your pump application.

Liquidyne® pump shaft seal

Predictable lifetime & environmentally friendly

The Liquidyne® pump shaft seal has a predictable lifetime due to the condition monitoring function. It is also environmentally friendly due to the water-lubricated system that saves energy through reduced friction.

Liquidyne pump shaft seals add quality and reliability to your operation and have already been successfully installed in around 10,000 pumps. Lagersmit currently delivers Peace of Mind to a vast range of pump manufacturers, petrochemical and energy companies. Shell, Nouryon Industrial Chemicals (formerly AkzoNobel), Stork and Sabic use the Liquidyne to their full satisfaction.

Liquidyne pump shaft seal installed at pump
Sabic Bufa Plant

Comparison with gland packing and mechanical seal

Pump shaft seal failure is one of the most common reasons for pump downtime. That’s why you want a reliable pump seal, which ensures optimal operation hours and keeps going. In our blog we compared the Liquidyne to two types of pump seals: gland packing and mechanical seal.

Cooling-water pump


A number of years ago, SABIC and Lagersmit teamed up as part of a Global Framework Agreement. This collaboration started in 2004 with the successful installation of a Liquidyne® seal for a cooling-water pump from SABIC’s BUFA plant.

Liquidyne 3-Stage

The Liquidyne 3-Stage is especially developed for dredging pumps that process a polluted medium with abrasive media particles that are larger than 100 µm. The Liquidyne seals the pump shaft and uses an external flush to lubricate, cool and clean the seal, while the drain flow enables the condition monitoring.


More information


Nouryon Industrial Chemicals

Liquidyne® for circulation pumps

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Gland packing converted into a Liquidyne® seal

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Do you want more information or specialist advice about our pump shaft seals? Contact one of our experts!

Dustin van Horik and Jan Willem Bongers from Lagersmit
General phone number